I just moved up from a Cherokee 235 to a 1975 Cherokee 6/300. The previous owner did a great job updating the panel with a GTN 750, G500txi and STEC 3100. It’s an awesome platform and would do it the same way if I had to do again. The touchscreens are so intuitive. It certainly is a costly upgrade for anyone looking to do so but still a fraction of anything new. Highly recommend.